C1-02 - Communication Abnormality Between Main Pcb And Option Pcb - Daikin Sky Air FAA71BUV1B Service Manual

3.3.6 C1-02 – Communication abnormality between main PCB and option PCB
FAA71+100BUV1B
Sky Air indoor units
ESIE22-01 – 2022.02
1 Check the power supply to the indoor unit. See
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance),
▪ Phase missing,
▪ Power drop,
▪ Short circuit.
2 Perform a power reset. If the error disappears and is raised again after a
while, check for the presence of an external source causing electrical noise.
See "5.4 External factors" [
Possible cause: External source may cause interference.
3 Check if the correct spare part is installed for the indoor unit main PCB. See
"4.5 Indoor unit main
adapter is connected to X23A of the PCB.
Possible cause: Incorrect spare part PCB or incorrect capacity setting adapter.
4 Perform a check of the indoor unit main PCB. See
4
PCB" [ 53].
Possible cause: Faulty indoor unit main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
Communication
abnormality between
indoor unit main PCB and
option PCB.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check communication wiring (insertion and continuity) on the option PCB
connector on the indoor unit main PCB and the connector on the option PCB.
See "7.2 Wiring diagram" [
Possible cause: Faulty or damaged communication wiring between indoor
unit main PCB and option PCB.
2 Perform power reset. If error is NOT resolved:
▪ Perform a check of the indoor unit main PCB. See
4
PCB" [ 53].
Possible cause: Faulty indoor unit main PCB.
Perform a check
4
components" [ 87].
Possible cause: Faulty option PCB.
4
88].
4
PCB" [ 53]. Check that the correct capacity setting
Effect
The unit stops and will
resume operation in
thermostat OFF.
4 93].
of the option PCB.
3 Troubleshooting
|
4
"5.1 Electrical circuit" [
"4.5 Indoor unit main
Reset
Auto reset after option
PCB is detected normally.
"4.5 Indoor unit main
See "5.3 Manufacturer
Service manual
83].
27